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Earth-tide measurements in Southeastern Australia

SCHOOL OF GEOLOGY UNIVERSITY OF MELBOURNE, MELBOURNE, Australia

Abstract

Strain data from the University of Melbourne's Allandale strain meter installation are here presented for the period 1400/16/8/72 to 0600/28/9/72 (GMT). This record is considered to consist of the earth-tide signal plus noise. The noise includes all contaminating effects. The constitution of this noise is investigated, and it is concluded that the major contributing effects are the thermoelastic response of the ground to changes in surface temperature, the pressure changes in the strain-meter chamber, and the loading effects of nearby seas.

Attempts have been made to subtract this noise from the data record. The earth-tide signal obtained is then compared with the theoretical response of the strain meter. The comparison suggests that the thermoelastic effect has not been taken fully into account and that the coupling of the strain-meter to the ground is not perfect.

From the observed earth-tide signal, the ratio of Love's numbers h, l; h/l = 10 ± 1, is calculated. This value is independent of the strain-meter coupling but is likely to be smaller than the actual value due to the residual thermoelastic noise on the signal.